EP2699700A2 - Integrated device for nucleic acid detection and identification - Google Patents
Integrated device for nucleic acid detection and identificationInfo
- Publication number
- EP2699700A2 EP2699700A2 EP12774413.4A EP12774413A EP2699700A2 EP 2699700 A2 EP2699700 A2 EP 2699700A2 EP 12774413 A EP12774413 A EP 12774413A EP 2699700 A2 EP2699700 A2 EP 2699700A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- amplification
- nucleic acid
- detection
- labeling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
- C12Q1/686—Polymerase chain reaction [PCR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502723—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by venting arrangements
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/26—Preparation of nitrogen-containing carbohydrates
- C12P19/28—N-glycosides
- C12P19/30—Nucleotides
- C12P19/34—Polynucleotides, e.g. nucleic acids, oligoribonucleotides
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2522/00—Reaction characterised by the use of non-enzymatic proteins
- C12Q2522/10—Nucleic acid binding proteins
- C12Q2522/101—Single or double stranded nucleic acid binding proteins
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2527/00—Reactions demanding special reaction conditions
- C12Q2527/101—Temperature
Definitions
- Embodiments of the present invention relate to an integrated device and related methods for detecting and identifying nucleic acids.
- the device may be fully disposable or may comprise a disposable portion and a reusable portion.
- nucleic acid tests are unsuitable or of limited utility for field use because they require elaborate and costly instrumentation, specialized laboratory materials and/or multiple manipulations dependent on user intervention. Consequently, most samples for molecular testing are shipped to centralized laboratories, resulting in lengthy turn-around-times to obtain the required information.
- PCR or other nucleic acid amplification reactions such as loop mediated amplification (LAMP), nucleic acid based sequence amplification (NASBA) and other isothermal and thermal cycling methods are typically conducted in testing and research laboratories using reaction volumes of 5 to 100 microliters. These reaction volumes accommodate test specimen volumes sufficient to ensure the detection of scarce assay targets in dilute specimens. Microfluidic systems that reduce reaction volumes relative to those employed in traditional laboratory molecular testing necessarily also reduce the volume of specimen that can be added to the reaction. The result of the smaller reaction volume is a reduction in capacity to accommodate sufficient specimen volume to ensure the presence of detectable amounts of target in dilute specimens or where assay targets are scarce.
- LAMP loop mediated amplification
- NASBA nucleic acid based sequence amplification
- the disposable platform optionally further comprises a sample preparation stage comprising an output in direct fluid connection with an input of the sample chamber.
- Dimensions of a substantially flat surface of the amplification chamber are preferably approximately the same as dimensions of a substantially flat surface of a resistive heating element in thermal contact with the amplification chamber.
- the amplification chamber is preferably not cooled by an active cooling device.
- the amplification chamber optionally contains an amplification solution
- the sample chamber optionally comprises a liquid amplification reagent mix or a lyophilized amplification reagent mix
- the labeling chamber optionally comprises detection particles.
- the labeling chamber is preferably heatable using one of the resistive heating elements.
- the detection subsystem comprises a lateral flow strip that preferably does not comprise detection particles.
- FIG. 1 is a drawing illustrating the fluidic and electronic layers for an embodiment of the present invention.
- Prepared sample fluid enters the sample chamber where it is mixed with preferably lyophilized reagents.
- pressure of the fluid column equilibrates with the sealed volume of air below it. Capillarity prevents the escape of air and further advancement of fluid.
- the appropriate vent seal underlying the corresponding vent pocket is ruptured, fluid moves through the outlet channel to the next chamber for further processing.
- FIG. 4 depicts embodiments of the present invention which support either thermal cycling or isothermal-based nucleic acid amplification methodologies.
- FIG. 4A shows a PCA with four resistor/thermistor pairs. Four surface mount resistors serve as four independently controllable heaters (arrows).
- FIG. (B shows a fluidic assembly attached to the PCA of FIG. 4A consistent with the resistive heater detail of FIG. 3. The fluidic layer interfaces with the surface mount resistors of the PCA to provide reaction chambers for nucleic acid amplification.
- FIG. 4C shows gel electrophoresis of amplification reactions producing a -150 bp (base pair) product from a PCR machine (LAB) or by an embodiment of the present invention ( Heater) by thermal cycling.
- FIG. 4D is a graph of temperature versus time in seconds for fluid within the amplification chamber of the present embodiments.
- the darker line indicates temperature of solution in the reaction chamber obtained by thermocouple.
- the lighter line is the temperature measured by the thermistor used by the microcontroller for temperature control. 40 cycles of a two-temperature PCR reaction can be accomplished in less than 20 minutes using a 20 ⁇ reaction volume.
- FIG. 4E shows gel electrophoresis of isothermal Nucleic Acid Sequence Based Amplification (NASBA) reactions producing an -150 bp product from a PCR machine (Positive Control), or by use of an embodiment of the present invention. Four separate reactions indicate both the setting of the temperature sensor, and a particular surface treatment applied to the interior of the fluidic chamber.
- NASBA isothermal Nucleic Acid Sequence Based Amplification
- FIG. 6 shows the detail and function of a labeling chamber of an embodiment of the present invention.
- Fluid containing amplicon enters the labeling chamber through the inlet channel and contacts detection particles. Sufficient mixing is accomplished by heating or boiling of fluid. Rising bubbles nucleated at the bottom and sides of the chamber, preferably by a textured feature such as a laser etched line or series of lines, preferably effectively stir the mixture.
- SMD components are the same as those used in the amplification heater.
- FIG. 7 shows the components of the fluidic layer of an embodiment of the present invention.
- a wall component of chosen thickness is bonded on two sides by face components.
- the wall component is 0.5 mm laser cut acrylic and the faces are 0.004" polyester (PET) film.
- PET polyester
- the parts are preferably bonded together with a silicone transfer adhesive. Interior surfaces are treated to control wetting. Reagents and lateral flow assembly are added during fabrication.
- An adhesive membrane is preferably sealed over the vent pockets.
- FIG. 9 is a drawing illustrating the fluid cassette bonded to the PCA with an adhesive shim in accordance with an embodiment of the present invention.
- the shim thickness can be important to proper distancing and function of the vents and heaters.
- FIG. 1 1 B is a drawing illustrating the layout of the back side of the PCA of the disposable invention configuration of FIG. 1 1 A.
- This side of the PCB holds the control circuitry such as the microcontroller, MOSFET switches, and ancillary circuitry.
- terminals are present for a 9V battery, as well as optional user interface devices such as tactile switches useful for assay initiation.
- FIG. 14 shows an exploded view of a disposable assay cartridge incorporating the fluidic layer of FIG. 13.
- FIG. 15 is an illustration of the assembled disposable PCA/fluidic assembly of FIG. 14 in place in a docking station.
- Embodiments of the present invention comprise a disposable platform which integrates instrumentation independent means of conducting all requisite steps of a nucleic acid molecular assay and complements current immuno-lateral flow rapid assays with a new generation of nucleic acid tests offering more informative and sensitive analyses.
- Embodiments of the present invention facilitate the broader use of rapid nucleic acid testing in small clinics and austere settings where infectious disease, biothreat agent, agriculture and environmental testing are the most likely to have the greatest impact.
- Certain embodiments of the present invention are completely self- contained and disposable which enables "surge capacity" in times of increased demand by allowing parallel tests to be run without instrumentation-imposed bottlenecks.
- Embodiments of the present invention provide systems and methods for low-cost, point-of- use nucleic acid detection and identification suitable to perform analyses in locations remote from a laboratory environment where testing would ordinarily be performed.
- nucleic acid amplification reaction volumes can be in the same volume range commonly used in traditional laboratory testing (e.g. 5-100 ⁇ _).
- the reaction conducted in embodiments of the present invention is thus directly comparable to accepted laboratory assays, and allows the accommodation of the same specimen volumes typically employed in traditional molecular testing.
- Embodiments of the present invention may be used to detect the presence of a target nucleic acid sequence or sequences in a sample.
- Target sequences may be DNA such as chromosomal DNA or extra-chromosomal DNA (e.g. mitochondrial DNA, chloroplast DNA, plasmid DNA etc) or RNA (e.g. rRNA, mRNA, small RNAs and viral RNA).
- RNA e.g. rRNA, mRNA, small RNAs and viral RNA.
- embodiments of the invention may be used to identify nucleic acid polymorphisms including single nucleotide polymorphisms, deletions, insertions, inversions and sequence duplications.
- embodiments of the invention may be used to detect gene regulation events such as gene up- and down- regulation at the level of transcription.
- Embodiments of the present invention are devices for low-cost, point-of-use nucleic acid testing suitable to perform analyses in locations remote from a laboratory environment where testing would ordinarily be performed.
- Certain devices comprise fluidic and electronic components or layers, optionally encased by a protective housing.
- the fluidic layer is composed of plastic and is a series of chambers and pockets connected by narrow channels in which chambers are oriented vertically with respect to one another during operation.
- the fluidic layer is overlaid or otherwise placed in physical contact with electronic components such as a printed circuit board containing off-the-shelf surface mount devices (SMDs) and controlled via a microcontroller.
- the entire assembly is disposable.
- the following enzymes were added to the eluted nucleic acid sample in the sample chamber and briefly mixed using a gel-loading pipette tip.
- Candidatus Liberibacter asiaticus the etiologic agent of citrus greening without a preceding nucleic acid isolation step.
- a partially disposable device as described above was constructed.
- the reusable unit comprised a standard 1.5 oz copper-clad PCB.
- Circuit components included an ATmega328 microcontroller, 0.5 Amp N-channel MOSFETs, SMD resistors, and power conditioning components.
- a stereolithography (SLA) formed plastic shell covered the board and tactile switches.
- a female pin connector was mounted to the top surface to allow for a vertical connection to the disposable PCA.
- the disposable PCA comprised a similar PCB along with thick-film resistors, 0402 thermistor, and 0603 LEDs.
- a right angle male pin connector was placed one end of the board to allow for vertical orientation when inserted into the female socket of the reusable unit.
- the assayed specimen was comprised of 4 ⁇ _ of crude citrus tissue extract prepared by crushing 5 biopsy punches of 1 .5 mm diameter in 500 ⁇ _ of nuclease free water.
- the primers hyvl_For and hyvl_Rev were used to amplify a 139 bp nucleic acid sequence diagnostic for the presence of plant pathogenic bacteria Candidatus Liberibacter asiaticus. Proprietary amplification reaction chemistry was performed.
- the detection oligonucleotide conjugated to the dyed microspheres was complementary to the sense strand of the nucleic acid amplification product.
- the labeling chamber was heated to 105 °C for 2 minutes and then maintained at 90 °C for 30 seconds to induce boiling and thorough mixing of the polystyrene beads and denature the double-stranded DNA product. After heating, reaction solution in the labeling chamber was allowed to cool for two minutes. The detection chamber was vented, causing the solution to flow from the labeling chamber to the detection chamber and onto the detection strip assembly.
- EXAMPLE 4 Method of Amplification and Detection of a Target Nucleic Acid for the Detection of Candidatus Liberibacter in the Asian Citrus Psyllid Diaphorina citri Kuwavama
- An embodiment of the invention wherein a disposable component interfaces with a reusable dock was fabricated as described in Example 3 and employed to test crude whole insect extracts prepared from Diaphorina citri Kuwavama for the presence of Candidatus Liberibacter asiaticus, the etiologic agent of citrus greening without a preceding nucleic acid isolation step.
- a lyophilized bead composed of reaction enzymes and excipients, was added to the sample chamber. After completion of device assembly, 40 ⁇ of a reaction mixture was added to the sample chamber. Depending on the experiment, enzymes required for amplification were either present in this reaction mixture in liquid form, or present in a lyophilized cake incorporated into the sample chamber of the fluidic layer. In both cases, the sample was comprised of 4 ⁇ of a solution prepared by crushing 5 whole live Diaphorina citri Kuwavama in 500 ⁇ of nuclease free water.
- An embodiment of the invention wherein a disposable component interfaces with a reusable dock was fabricated as described in Example 3 and employed to test crude periwinkle (Catharanthus roseus) tissue extracts for the presence of Candidatus Liberibacter asiaticus, the etiologic agent of citrus greening without a preceding nucleic acid isolation step.
- a lyophilized bead composed of reaction enzymes and excipients, was added to the sample chamber. After completion of device assembly, 40 ⁇ of a reaction mixture was added to the sample chamber. Depending on the experiment, enzymes required for amplification were either present in this reaction mixture in liquid form, or present in a lyophilized cake incorporated into the sample chamber of the fluidic layer. In both cases, the sample was comprised of 4 ⁇ of a solution prepared by crushing 5 biopsy punches of 1.5 mm diameter each in 500 ⁇ of nuclease free water. Biopsy punches were obtained from either Candidatus Liberibacter asiaticus infected or uninfected periwinkle (Catharanthus roseus).
- Venting of the amplification chamber and initiation of the amplification and detection program was accomplished by pressing a tactile switch on the reusable unit that serves as a start button. After venting, the reaction solution entered the amplification chamber where the solution was heated to 85 °C for 2 minutes, followed by 40 cycles of: 76 °C for 10 seconds and 60 °C for 25 seconds. After thermal cycling was complete, the reaction was allowed to flow into the labeling chamber by microcontroller-initiated venting.
- the labeling chamber contained blue dyed polystyrene detection microspheres dried to one interior face of the labeling chamber in the presence of 500 mM sucrose.
- the detection oligonucleotide conjugated to the dyed microspheres was complementary to the sense strand of the nucleic acid amplification product.
- the labeling chamber was heated to 105 °C for 2 minutes and then maintained at 90 °C for 30 seconds to induce boiling and thorough mixing of the polystyrene beads and denature the double-stranded DNA product. After heating, reaction solution in the labeling chamber was allowed to cool for two minutes. The detection chamber was vented, causing the solution to flow from the labeling chamber to the detection chamber and onto the detection strip assembly.
- the sample was comprised of 4 ⁇ _ of a solution prepared by crushing a 1 cm length of dodder (Cuscuta pentagons) vine in 500 ⁇ _ of nuclease free water.
- the primers hyvl_For and hyvl_Rev were used to amplify a 139 bp nucleic acid sequence diagnostic for the presence of plant pathogenic bacteria Candidates Liberibacter asiaticus.
- Proprietary amplification reaction chemistry was performed.
- Amplification buffer (10X) was premade and contained 400 mM Tris-HCI (pH 8.4), 10 mM ammonium sulfate, 100 mM potassium chloride, and 0.25% Triton X-100.
- Each fourty ⁇ _ of reaction solution contained:
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201161477357P | 2011-04-20 | 2011-04-20 | |
US201161477437P | 2011-04-20 | 2011-04-20 | |
PCT/US2012/034596 WO2012145730A2 (en) | 2011-04-20 | 2012-04-20 | Integrated device for nucleic acid detection and identification |
Publications (4)
Publication Number | Publication Date |
---|---|
EP2699700A2 true EP2699700A2 (en) | 2014-02-26 |
EP2699700A4 EP2699700A4 (en) | 2015-02-18 |
EP2699700B1 EP2699700B1 (en) | 2016-04-20 |
EP2699700B8 EP2699700B8 (en) | 2016-08-24 |
Family
ID=47042196
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12774413.4A Active EP2699700B8 (en) | 2011-04-20 | 2012-04-20 | Integrated device for nucleic acid detection and identification |
EP12773717.9A Active EP2699698B9 (en) | 2011-04-20 | 2012-04-20 | Oscillating amplification reaction for nucleic acids |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12773717.9A Active EP2699698B9 (en) | 2011-04-20 | 2012-04-20 | Oscillating amplification reaction for nucleic acids |
Country Status (10)
Country | Link |
---|---|
US (7) | US10519492B2 (en) |
EP (2) | EP2699700B8 (en) |
JP (3) | JP5879667B2 (en) |
KR (3) | KR101508670B1 (en) |
CN (2) | CN103649333B (en) |
CA (2) | CA2856304C (en) |
DK (2) | DK2699700T3 (en) |
ES (2) | ES2583135T3 (en) |
PT (1) | PT2699698T (en) |
WO (2) | WO2012145730A2 (en) |
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